Fix current LCID detection in  back office
Fix Invalid usage of $this in Closure
Add new EditableConfiguration class
Remove default Change/I18n/supported-lcids configuration
Move en_GB LCID to en_US
Add new Change/Install/documentRootPath configuration entry
Fix ChangeTests\Change\I18n\I18nManagerTest tests
Merge pull request #145 from inthause/documents

Add some updates